Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 2104

December 21, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Dec 21, 2013, 5:06 PM CST for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Dec 21, 2013, 5:06 PM CST (23:06 UTC)
Expired: Dec 21, 2013, 6:30 PM CST
In force: 84 min
Issued by: the Storm Prediction Center

All 79 counties

Colbert County, AL, Lauderdale County, AL, Ascension Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Alcorn County, MS, Amite County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Lafayette County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pike County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Yalobusha County, MS, Yazoo County, MS, Chester County, TN, Decatur County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Madison County, TN, McNairy County, TN, Perry County, TN, Wayne County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 56 km from the middle of the area, began a volume at 23:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.1 hours before the alert went out and 50 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 81 J/kg
Mixed-layer CIN: -326 J/kg
Mixed-layer LCL: 592 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 275 m²/s²
0-3 km storm-relative helicity: 443 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 21, 2:31 AM CST	Mesoscale Discussion	SPC	Bossier, Caddo, Claiborne, De Soto, Webster	2 hr
Dec 21, 7:57 AM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 20 more	63 min
Dec 21, 9:46 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 33 more	8 hr
Dec 21, 12:30 PM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 21 more	60 min
Dec 21, 5:22 PM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Avoyelles, Catahoula, Concordia and 21 more	7 hr
Dec 21, 10:45 AM CST	Mesoscale Discussion	SPC	Benton, Bolivar, Coahoma, DeSoto, Lafayette, Leflore and 8 more	60 min
Dec 21, 12:01 PM CST	Tornado Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Coahoma and 23 more	8 hr
Dec 21, 2:50 PM CST	Mesoscale Discussion	SPC	Benton, Bolivar, Coahoma, DeSoto, Grenada, Lafayette and 9 more	55 min
Dec 21, 5:46 PM CST	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	6 hr

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Tennessee, 2013 Every mesoscale discussion in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.